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= 15a - 11a + 7b - 12b - 5c + 13d
= 4a - 5b - 5c + 13d
= (15a + 7b - 5c - 11a - 12b + 13d
= 15a - 11a + 7b - 12b - 5c + 13d
= 4a - 5b - 5c + 13d
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